Effect of 3D-Substitutional Atoms on the Magnetic and Magnetostrictive Properties in (Tb,Ho)Fe₂ Laves Phase

The crystal structure, magnetic and magnetostrictive properties of the Laves phases Tb<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.16</inf>Ho<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.84</inf>Fe<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2-x</inf>T<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</inf> (T = Co, Ni, x = 0.1, 0.2, 0.3, 0.4) are investigated. Polycrystalline samples were prepared by induction melting with subsequent homogenizing annealing. The studied compounds crystallize in a structure of the MgCu2 type. Partial substitution of iron by Co and Ni leads to a decrease in the parameter and volume of the unit cell by ~3%. The Curie and spin reorientation temperatures of the studied compounds were determined, magnetic phase diagrams were constructed. Compounds with high values of saturation magnetostriction and magnetostrictive susceptibility in the temperature range of 190-320 K were found.